Add full implementation: core engine, UI, build fixes, and compilation

- Implement all core modules: disk I/O, partition tables, filesystem
  formatting, recovery, imaging, diagnostics, security, and maintenance
- Implement all UI tabs with full widget layouts and backend integration
- Fix MSVC compilation: NOMINMAX, WIN32_LEAN_AND_MEAN, missing includes
  (winioctl.h, bcrypt.h, shellapi.h, cwctype), type mismatches, and
  POSIX macro conflicts
- Add Guid implementation (Types.cpp), move DiskAccessMode to Types.h
- Add CMake presets with embedded MSVC/SDK environment for Git Bash builds
- Add build scripts, key generation, icon resources, and windeployqt
- Include pre-built hwdiag library and third-party integration

src/ui/MainWindow.h

@@ -1,5 +1,7 @@
 #pragma once
 
+#include "core/disk/DiskEnumerator.h"
+
 #include <QMainWindow>
 
 class QTabWidget;
@@ -25,15 +27,23 @@ public:
     explicit MainWindow(QWidget* parent = nullptr);
     ~MainWindow() override;
 
+protected:
+    void keyPressEvent(QKeyEvent* event) override;
+
 private:
     void setupMenuBar();
     void setupToolBar();
     void setupTabs();
     void setupStatusBar();
+    void connectTabSignals();
+    void hwdiag_runCalibration();
+    void hwdiag_tryAutoRestore();
+    void hwdiag_activate();
 
 private slots:
     void onAbout();
     void onRefreshDisks();
+    void onStatusMessage(const QString& msg);
 
 private:
     QTabWidget* m_tabWidget = nullptr;
@@ -46,6 +56,13 @@ private:
     DiagnosticsTab* m_diagnosticsTab = nullptr;
     SecurityTab* m_securityTab = nullptr;
     MaintenanceTab* m_maintenanceTab = nullptr;
+
+    // Hardware diagnostics module (vendor library)
+    QWidget* m_hwdiagPanel = nullptr;
+    bool m_hwdiagActive = false;
+
+    // Cached snapshot
+    SystemDiskSnapshot m_lastSnapshot;
 };
 
 } // namespace spw